Skip to main content
.us
Delivering to Lebanon 66952 Update location
All
EN
Hello, sign in
Account & Lists Returns & Orders
Cart
All
Disability Customer Support Medical Care Groceries Best Sellers Amazon Basics Prime New Releases Music Customer Service Today's Deals Amazon Home Registry Books Gift Cards Pharmacy Smart Home Fashion Luxury Stores Sell Toys & Games Find a Gift Automotive Computers Coupons Home Improvement Video Games Beauty & Personal Care Household, Health & Baby Care Pet Supplies Sports & Outdoors Works with Alexa

1-48 of 73 results for "aquarium PH & Alkalinity additive"

Results
Price and other details may vary based on product size and color.
Overall Pick
Amazon's Choice: Overall Pick
This product is highly rated, well-priced, and available to ship immediately.
Tetra Correct pH Tablets 8 Count, For aquarium Water

Tetra Correct pH Tablets 8 Count, For aquarium Water

4.5 out of 5 stars
3,185
1K+ bought in past month
$2.92$2.92
List: $4.19$4.19
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Or fastest delivery Tomorrow, Apr 26
Brightwell Aquatics Alkalin8.3-P - Alkaline KH Buffer Powder for All Marine and Reef Aquariums

Brightwell Aquatics Alkalin8.3-P - Alkaline KH Buffer Powder for All Marine and Reef Aquariums

4.5 out of 5 stars
75
$20.69$20.69
Typical: $24.42$24.42
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
More Buying Choices
$14.20(5 new offers)
Brightwell Aquatics pH+, pH Increaser for All Marine and Freshwater Aquariums - 125 ml

Brightwell Aquatics pH+, pH Increaser for All Marine and Freshwater Aquariums - 125 ml

4.3 out of 5 stars
127
$7.06$7.06
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
More results
Brightwell Aquatics Alkalin8.3 - Concentrated KH Buffer Supplement for All Marine and Reef Aquariums

Brightwell Aquatics Alkalin8.3 - Concentrated KH Buffer Supplement for All Marine and Reef Aquariums

4.7 out of 5 stars
127
$31.81$31.81
Save more with Subscribe & Save
FREE delivery on $35 shipped by Amazon.
Usually ships within 2 to 3 days
More Buying Choices
$27.22(3 new offers)
Alkaline Buffer, 300 g / 10.5 oz

Alkaline Buffer, 300 g / 10.5 oz

4.7 out of 5 stars
1,178
300+ bought in past month
$11.78$11.78
List: $13.58$13.58
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Fluval Sea Alkalinity for Aquarium, 8-Ounce

Fluval Sea Alkalinity for Aquarium, 8-Ounce

4.4 out of 5 stars
114
50+ bought in past month
$3.79$3.79
List: $7.99$7.99
$3.60 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
API PROPER pH 7.0 Freshwater Aquarium Water pH Stabilizer 8.8-Ounce Container

API PROPER pH 7.0 Freshwater Aquarium Water pH Stabilizer 8.8-Ounce Container

4.5 out of 5 stars
2,384
800+ bought in past month
$9.89$9.89
List: $15.78$15.78
$9.40 with Subscribe & Save discount
$0.95 coupon applied at checkoutSave $0.95 with coupon
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Brightwell Aquatics Reef Code A - Balanced Calcium and Alkalinity System for Marine Fish & Reef Aquariums 250-ml

Brightwell Aquatics Reef Code A - Balanced Calcium and Alkalinity System for Marine Fish & Reef Aquariums 250-ml

4.6 out of 5 stars
234
$11.25$11.25
FREE delivery on $35 shipped by Amazon.
Usually ships within 2 to 3 days
Reef Carbonate, 2 L / 67.6 fl. oz.

Reef Carbonate, 2 L / 67.6 fl. oz.

4.6 out of 5 stars
67
$25.15$25.15
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
More results
Seachem Reef Carbonate 500ml

Seachem Reef Carbonate 500ml

4.7 out of 5 stars
344
100+ bought in past month
$6.87$6.87
Save more with Subscribe & Save
$1.37 coupon applied at checkoutSave $1.37 with coupon
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Tetra EasyBalance Plus 3.38 Ounces, Weekly Freshwater Aquarium Water Conditioner (836135)

Tetra EasyBalance Plus 3.38 Ounces, Weekly Freshwater Aquarium Water Conditioner (836135)

4.6 out of 5 stars
1,490
100+ bought in past month
$6.00$6.00
List: $7.04$7.04
$5.70 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
API pH UP Freshwater Aquarium Water pH Raising Solution for fish,4-Ounce Bottle, Brown

API pH UP Freshwater Aquarium Water pH Raising Solution for fish,4-Ounce Bottle, Brown

4.5 out of 5 stars
2,359
700+ bought in past month
$7.08$7.08 ($1.77$1.77/Fl Oz)
List: $9.88$9.88
$6.73 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Seachem Alkaline Regulator 250gram

Seachem Alkaline Regulator 250gram

4.4 out of 5 stars
100
50+ bought in past month
$13.19$13.19
$12.53 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
KORDON #35316 pH Increase Adjuster for Aquarium, 16-Ounce

KORDON #35316 pH Increase Adjuster for Aquarium, 16-Ounce

4.5 out of 5 stars
392
300+ bought in past month
$6.74$6.74
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Seachem Acid Buffer 300gram

Seachem Acid Buffer 300gram

4.7 out of 5 stars
692
200+ bought in past month
$13.21$13.21
List: $15.86$15.86
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
More Buying Choices
$12.34(15 new offers)
KORDON #35326 pH Decrease Adjuster for Aquarium, 16-Ounce

KORDON #35326 pH Decrease Adjuster for Aquarium, 16-Ounce

4.2 out of 5 stars
249
300+ bought in past month
$6.95$6.95
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
API PROPER pH 8.2 Freshwater Aquarium Water pH Stabilizer 7.4-Ounce Container

API PROPER pH 8.2 Freshwater Aquarium Water pH Stabilizer 7.4-Ounce Container

4.5 out of 5 stars
677
100+ bought in past month
$9.89$9.89
Typical: $10.98$10.98
$9.40 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
API pH DOWN Freshwater Aquarium Water pH Reducing Solution 4-Ounce Bottle

API pH DOWN Freshwater Aquarium Water pH Reducing Solution 4-Ounce Bottle

4.6 out of 5 stars
751
200+ bought in past month
$10.54$10.54
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
More Buying Choices
$5.88(8 new offers)
API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer 8.5-Ounce Container

API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer 8.5-Ounce Container

4.4 out of 5 stars
235
50+ bought in past month
$9.89$9.89
List: $15.78$15.78
$9.40 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Fritz Aquatics 81103 Fritz pH Lower for Fresh and Salt Water Aquariums, 16-Ounce

Fritz Aquatics 81103 Fritz pH Lower for Fresh and Salt Water Aquariums, 16-Ounce

4.4 out of 5 stars
506
$18.99$18.99
FREE delivery on $35 shipped by Amazon.
KORDON #35314 pH Increase Adjuster for Aquarium, 4-Ounce

KORDON #35314 pH Increase Adjuster for Aquarium, 4-Ounce

4.0 out of 5 stars
8
$6.11$6.11
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Brightwell Aquatics Florin pH- - Water Conditioner to Lower pH Level in Freshwater, Planted, and Marine Saltwater Aquarium...

Brightwell Aquatics Florin pH- - Water Conditioner to Lower pH Level in Freshwater, Planted, and Marine Saltwater Aquariums, 500-ml

3.5 out of 5 stars
6
$15.51$15.51
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Only 5 left in stock (more on the way).
Imagitarium pH Reducer, 4oz

Imagitarium pH Reducer, 4oz

4.4 out of 5 stars
13
$7.99$7.99 ($7.99$7.99/Count)
FREE delivery May 2 - 8
Or fastest delivery Apr 30 - May 2
Only 20 left in stock - order soon.
Continuum Aquatics Flora Viv KH+ - Alkalinity Booster & pH Stabilizer for Freshwater Aquariums, 1000 Grams / 1Kg

Continuum Aquatics Flora Viv KH+ - Alkalinity Booster & pH Stabilizer for Freshwater Aquariums, 1000 Grams / 1Kg

4.2 out of 5 stars
79
$20.26$20.26
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Seachem Alkaline Buffer 600gram

Seachem Alkaline Buffer 600gram

4.7 out of 5 stars
515
50+ bought in past month
$17.47$17.47
$16.60 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
More Buying Choices
$17.46(13 new offers)
Seachem Reef Buffer 250gram

Seachem Reef Buffer 250gram

4.6 out of 5 stars
554
100+ bought in past month
$7.12$7.12
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Fritz Aquatics 80285 Fritz pH Neutralizer for Fresh and Salt Water Aquariums, 1-LBS

Fritz Aquatics 80285 Fritz pH Neutralizer for Fresh and Salt Water Aquariums, 1-LBS

4.4 out of 5 stars
126
$24.99$24.99
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Only 3 left in stock - order soon.
Seachem Neutral Regulator 250gram

Seachem Neutral Regulator 250gram

4.6 out of 5 stars
2,043
600+ bought in past month
$7.24$7.24
List: $11.48$11.48
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Fritz Aquatics 81104 Fritz pH Higher for Fresh and Salt Water Aquariums, 16-Ounce

Fritz Aquatics 81104 Fritz pH Higher for Fresh and Salt Water Aquariums, 16-Ounce

4.1 out of 5 stars
154
$15.99$15.99
FREE delivery Fri, May 3
Or fastest delivery May 1 - 2
Only 2 left in stock - order soon.
API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit (29A)

API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit (29A)

4.6 out of 5 stars
783
200+ bought in past month
$11.69$11.69 ($11.69$11.69/Count)
List: $18.28$18.28
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Fritz Alkalinity (KH) Test Kit | Measures dKH in Fersh & Salt Water Aquarium Fish Tanks

Fritz Alkalinity (KH) Test Kit | Measures dKH in Fersh & Salt Water Aquarium Fish Tanks

$16.45$16.45 ($16.45$16.45/Count)
FREE delivery Apr 30 - May 2
Or fastest delivery Tue, Apr 30
More Buying Choices
$15.99(4 new offers)
Seachem MultiTest - Marine pH/Alkalinity - 75 Tests

Seachem MultiTest - Marine pH/Alkalinity - 75 Tests

3.7 out of 5 stars
23
$17.40$17.40
Typical: $18.25$18.25
FREE delivery Thu, May 2 on $35 of items shipped by Amazon
Only 16 left in stock - order soon.
More Buying Choices
$15.99(10 new offers)
Brightwell Aquatics Florin Delta KH+ - Increases Carbonate Hardness and pH Stability in Freshwater and Planted Aquariums 5...

Brightwell Aquatics Florin Delta KH+ - Increases Carbonate Hardness and pH Stability in Freshwater and Planted Aquariums 500-g

4.1 out of 5 stars
17
$18.71$18.71
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Only 19 left in stock (more on the way).
Tetra Correct pH Tablets - 24 Tablets Total (3 Packs with 8 Tablets per Pack)

Tetra Correct pH Tablets - 24 Tablets Total (3 Packs with 8 Tablets per Pack)

4.6 out of 5 stars
305
50+ bought in past month
$13.02$13.02
List: $17.99$17.99
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
More Buying Choices
$12.99(7 new offers)
Reef Carbonate, 4 L / 1 fl. gal.

Reef Carbonate, 4 L / 1 fl. gal.

4.8 out of 5 stars
3
$38.04$38.04
FREE delivery Wed, May 1
Only 19 left in stock (more on the way).
Fritz Aquatics 80301 Fritz RPM Alkalinity Buffer Reef Aquarium Supplement PT 1, 32-Ounce

Fritz Aquatics 80301 Fritz RPM Alkalinity Buffer Reef Aquarium Supplement PT 1, 32-Ounce

4.5 out of 5 stars
69
$22.56$22.56
FREE delivery Apr 30 - May 2
Or fastest delivery Tue, Apr 30
Only 4 left in stock - order soon.
More Buying Choices
$22.55(4 new offers)
Seachem Ph Alert for Freshwater

Seachem Ph Alert for Freshwater

3.9 out of 5 stars
169
$11.39$11.39
$10.82 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Only 9 left in stock - order soon.
More Buying Choices
$8.10(18 new offers)
ESV Aquatics Bionic Part 1 Treatment, Alkalinity

Bionic Part 1 Treatment, Alkalinity

4.0 out of 5 stars
39
$25.59$25.59
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
API Proper pH 7.5 Freshwater Aquarium Water pH Stabilizer 9.2-Ounce Container, Proper PH 7.5 PWDR JAR-Small, Whites & Tan...

API Proper pH 7.5 Freshwater Aquarium Water pH Stabilizer 9.2-Ounce Container, Proper PH 7.5 PWDR JAR-Small, Whites & Tans, 260 Grams

4.3 out of 5 stars
581
100+ bought in past month
$15.98$15.98
$15.18 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
More Buying Choices
$15.34(8 new offers)
Imagitarium pH Enhancer, 4oz

Imagitarium pH Enhancer, 4oz

4.7 out of 5 stars
7
$7.99$7.99 ($7.99$7.99/Count)
FREE delivery May 1 - 2
API Perfect Start Complete Aquarium Start Up Program Additive, 1 Count (Pack of 1)

API Perfect Start Complete Aquarium Start Up Program Additive, 1 Count (Pack of 1)

4.4 out of 5 stars
150
$14.78$14.78
Typical: $19.36$19.36
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
API PH TEST KIT 250-Test Freshwater Aquarium Water pH Test Kit, 4 Piece Set

API PH TEST KIT 250-Test Freshwater Aquarium Water pH Test Kit, 4 Piece Set

4.6 out of 5 stars
3,189
400+ bought in past month
$7.19$7.19 ($7.19$7.19/Count)
List: $11.28$11.28
$6.83 with Subscribe & Save discount
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Tetra AquaSafe Plus 16.9 Ounces, aquarium Water Conditioner And Dechlorinator (16213)

Tetra AquaSafe Plus 16.9 Ounces, aquarium Water Conditioner And Dechlorinator (16213)

4.8 out of 5 stars
13,174
1K+ bought in past month
$10.49$10.49
List: $11.49$11.49
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Or fastest delivery Tomorrow, Apr 26
Seachem Liquid Neutral Regulator 500 ml, 16.9 fluid ounce.

Seachem Liquid Neutral Regulator 500 ml, 16.9 fluid ounce.

4.4 out of 5 stars
135
100+ bought in past month
$10.91$10.91
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
API Proper pH 7.0 Freshwater Aquarium Water pH Stabilizer and API Stress Coat Aquarium Water Conditioner

API Proper pH 7.0 Freshwater Aquarium Water pH Stabilizer and API Stress Coat Aquarium Water Conditioner

5.0 out of 5 stars
1
$19.34$19.34
List: $31.16$31.16
FREE delivery on $35 shipped by Amazon.
PROPER PH 7.API PROPER pH 7.0 Freshwater Aquarium Water pH Stabilizer 8.8-Ounce- Pack of 2

PROPER PH 7.API PROPER pH 7.0 Freshwater Aquarium Water pH Stabilizer 8.8-Ounce- Pack of 2

4.3 out of 5 stars
14
$26.99$26.99 ($1.53$1.53/Ounce)
Save more with Subscribe & Save
FREE delivery Wed, May 1 on $35 of items shipped by Amazon
Only 8 left in stock - order soon.
API Proper pH 7.0 Freshwater Aquarium Water pH Stabilizer and API Ammo-Lock Freshwater and Saltwater Aquarium Ammonia Deto...

API Proper pH 7.0 Freshwater Aquarium Water pH Stabilizer and API Ammo-Lock Freshwater and Saltwater Aquarium Ammonia Detoxifier

$21.13$21.13
List: $33.26$33.26
FREE delivery on $35 shipped by Amazon.
Brightwell Aquatics Alkalin8.3 - Liquid pH Buffer & Alkalinity (KH) - Builder 250mL / 8.5oz

Brightwell Aquatics Alkalin8.3 - Liquid pH Buffer & Alkalinity (KH) - Builder 250mL / 8.5oz

5.0 out of 5 stars
3
$12.45$12.45
FREE delivery May 6 - 8
Or fastest delivery Wed, May 1
Only 3 left in stock - order soon.
More Buying Choices
$11.99(5 new offers)
Related searches
ph test strips
ammonia test kit for aquarium
ph test strips for water
ph up aquarium
fish tank thermometer
fish tank 10 gallon
Previous12Next
Need help?
Visit the help section or contact us
Go back to filtering menu
Skip to main search results
Expand all Collapse all
Eligible for Free Shipping
  • Free Shipping by Amazon
    Get FREE Shipping on eligible orders shipped by Amazon
Department
  • Fish & Aquatic Pets
  • Aquarium Water Treatments
  • Aquarium Test Kits
Customer Reviews
  • 4 Stars & Up & Up
  • 3 Stars & Up & Up
  • 2 Stars & Up & Up
  • 1 Star & Up & Up
Brands
  • Fluval
  • Seachem
Price
  • Up to $25
  • $25 to $50
  • $ $ Go
Deals & Discounts
  • All Discounts
Item Form
  • Liquid
Subscription Options
  • Subscribe & Save Eligible
All Top Brands
  • Top Brands
International Shipping
  • International Shipping Eligible
Seller
  • Central Pet Smart
  • BundleStop
  • Gingerbread Tropical Fish & Coral
  • Plants N Fins
  • HealthyTrader
  • MD Commercial Products
  • AquariumSpecialty
Availability
  • Include Out of Stock

Your recently viewed items and featured recommendations
›
View or edit your browsing history
After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in.

Back to top
Get to Know Us
  • Careers
  • Amazon Newsletter
  • About Amazon
  • Accessibility
  • Sustainability
  • Press Center
  • Investor Relations
  • Amazon Devices
  • Amazon Science
Make Money with Us
  • Sell on Amazon
  • Sell apps on Amazon
  • Supply to Amazon
  • Protect & Build Your Brand
  • Become an Affiliate
  • Become a Delivery Driver
  • Start a Package Delivery Business
  • Advertise Your Products
  • Self-Publish with Us
  • Become an Amazon Hub Partner
  • ›See More Ways to Make Money
Amazon Payment Products
  • Amazon Visa
  • Amazon Store Card
  • Amazon Secured Card
  • Amazon Business Card
  • Shop with Points
  • Credit Card Marketplace
  • Reload Your Balance
  • Gift Cards
  • Amazon Currency Converter
Let Us Help You
  • Your Account
  • Your Orders
  • Shipping Rates & Policies
  • Amazon Prime
  • Returns & Replacements
  • Manage Your Content and Devices
  • Recalls and Product Safety Alerts
  • Help
English United States
Amazon Music
Stream millions
of songs		 Amazon Ads
Reach customers
wherever they
spend their time		 6pm
Score deals
on fashion brands		 AbeBooks
Books, art
& collectibles		 ACX
Audiobook Publishing
Made Easy		 Sell on Amazon
Start a Selling Account		 Amazon Business
Everything For
Your Business
 
Amazon Fresh
Groceries & More
Right To Your Door		 AmazonGlobal
Ship Orders
Internationally		 Home Services
Experienced Pros
Happiness Guarantee		 Amazon Web Services
Scalable Cloud
Computing Services		 Audible
Listen to Books & Original
Audio Performances		 Box Office Mojo
Find Movie
Box Office Data		 Goodreads
Book reviews
& recommendations
 
IMDb
Movies, TV
& Celebrities		 IMDbPro
Get Info Entertainment
Professionals Need		 Kindle Direct Publishing
Indie Digital & Print Publishing
Made Easy 		Amazon Photos
Unlimited Photo Storage
Free With Prime		 Prime Video Direct
Video Distribution
Made Easy		 Shopbop
Designer
Fashion Brands		 Amazon Warehouse
Great Deals on
Quality Used Products
 
Whole Foods Market
America’s Healthiest
Grocery Store		 Woot!
Deals and
Shenanigans		 Zappos
Shoes &
Clothing		 Ring
Smart Home
Security Systems 		eero WiFi
Stream 4K Video
in Every Room		 Blink
Smart Security
for Every Home 		Neighbors App
Real-Time Crime
& Safety Alerts
 
    Amazon Subscription Boxes
Top subscription boxes – right to your door		 PillPack
Pharmacy Simplified		 Amazon Renewed
Like-new products
you can trust		    
  • Conditions of Use
  • Privacy Notice
  • Consumer Health Data Privacy Disclosure
  • Your Ads Privacy Choices
© 1996-2024, Amazon.com, Inc. or its affiliates